NK, NKG, NKE, NKGE

Overview

Overview

Grundfos NK/NKG pumps are used in water supply, industrial pressure boosting, industrial liquid transfer, HVAC (heating, ventilation and air-conditioning), irrigation and process industries.
Grundfos end-suction pumps are multi-purpose pumps suitable for a variety of different applications requiring reliable and cost-efficient supply. End-suction pumps are used in five main areas of application: water supply, industrial pressure boosting, industrial liquid transfer, HVAC (heating, ventilation and air-conditioning), and irrigation.
 
The pumps are all non-self-priming, single-stage, centrifugal volute pumps with axial suction port, radial discharge port and horizontal shaft. The Grundfos NK/NKG range comprises a complete series of long-coupled pumps that comply fully with either EN733 or ISO2858. The pumps are of the back pull-out design, enabling removal of the motor, coupling, bearing bracket and impeller without disturbing the pump housing or pipework. Even the largest pumps can thus be serviced by one person with a crane. The ISO2858 range of pumps are available with a bearing life of 100,000 hours, and can be fitted with double seals. They available in a stainless steel version as an option.

Applications

Grundfos offers a virtually limitless range of long-coupled (NK) end-suction pumps. Their sturdiness and reliability make them ideal for use in demanding environments such as the following:

  • District heating plants
  • Heating systems for blocks of flats
  • Air-conditioning systems
  • Cooling systems
  • Wash down systems
  • Other industrial systems.

 

Features and benefits

  • Optimised hydraulics in housing and impeller = unimpeded liquid flow
  • O-ring seal between pump housing and cover = no risk of leakage
  • Housing, impeller and wear ring in different materials = improved corrosion resistance, no sticking elements
  • Back pull-out design for easy dismantling for service
  • Pump is electro-coated to increase corrosion resistance
  • Available with IE1, IE2 and IE3  motors
  • PN 10/16 and 25 bar
  • Temperatures up to 180 °C
  • Available in a number of shaft seal and material variants.




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Benefits

  • Easy Service
  • E-solutions
  • Double seal solutions
Brochures

Brochures

 

NK – product brochure

NK – product brochure

Product brochure
Publication No: V7160550
Release date: 02-05-2007

Download PDF

1316 kb

NK – product brochure

NK – product brochure

Product brochure
Publication No: 96905269
Release date: 17-12-2009

Download PDF

1086 kb

Cases

Cases

Service
Installation

Installation

Information and advice

Grundfos is a world-wide provider of pumps and related systems. We have a trained staff of service engineers who will be able to support you during the installation phase of the pump or solution. Grundfos products are manufactured to very high standards, which helps to ensure a long life. Our many years of experience of different kinds of installation and with installation techniques are also key factors for maximising the lives of your Grundfos products or systems.

We will be able to support you with the following:

  • Information about the proper protection of our pumps
  • Advice on the physical positioning of the pump for necessary service/repair
  • Advice on the physical positioning of the pump to maintain proper operation
  • Correct cabling to fulfil the requirements of good practice and electromagnetic compatibility.

 

Please contact your local Grundfos company to obtain full support for your new installation.

Commissioning

In order to achieve optimum performance, it is very important that the product/system is set up and adjusted correctly from the outset. The knowledge and experience of the Grundfos service technician, and the use of dedicated Grundfos service tools to adjust the performance of the pump, together guarantee that the greatest possible efficiency and fully correct operation of the equipment are both achieved. Commissioning of the pump is recommended in the following cases:

  • If the pumps are controlled by a frequency converter
  • If the pump system is operating in a large system, e.g. a building management system
  • If the user wants to be trained in the proper operation of the pump
  • If the pump is a vital link in an important production/application facility
  • Where the setup is crucial for the Grundfos product to operate for its full planned life, e.g. in water treatment applications. In such cases commissioning is not only recommended but required
  • Where safety is an issue, e.g. in disinfection systems
  • The commissioning is performed in a step-by-step procedure, and a report of the settings of the pump is produced.

 

Do not hesitate to contact your local Grundfos company to arrange for the commissioning of your newly-installed Grundfos product.

Alignment

Correct installation helps to ensure a long life for Grundfos products. When a pump is driven by a separate motor, with both items mounted on a frame, it is very important that the two products are correctly and precisely aligned. Grundfos service engineers are trained by Grundfos development engineers to use the correct measurement techniques required to meet the exacting demands for a correct installation. Grundfos Service engineers are also equipped with the necessary Grundfos-recommended measuring tools for making correct alignments.

Please contact your local Grundfos company to arrange for the alignment of your Grundfos product.

Recommended spare parts

Even though the Grundfos strategy is to supply the best possible pump solutions to our customers, after a long period of operation there will be wear and tear to some of the components in certain situations. If short operating downtime is a requirement, or if the pump is installed in inaccessible areas where delivery of spare parts may take a long time, it is advisable to maintain a small stock of recommended spare parts on site.

Please contact your local Grundfos company to obtain information about recommended spare parts or service kits for your Grundfos product.





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Operation

Operation

Optimisation

Grundfos offers an efficiency analysis of your existing pump system, providing you with suggestions for increasing efficiency and thus for achieving cost savings over time.

Increase the efficiency of your existing system

Conducting an efficiency analysis of your existing pump system provides you with a basis for increasing efficiency and thus for achieving cost savings over time. An efficiency analysis results in suggestions for increasing efficiency and will show how this will save you money.

Grundfos offers the following levels of analysis for assessing the efficiency of your pump system:

  • Installed base checks.


A basic evaluation is carried out purely on the basis of the data from the identification plate on the pump, comparing its performance with that offered by newer, more efficient technology and materials found in modern pumps.

  • Pump efficiency quick check.


Pressure and the consumption of the pump in kWh are measured. Flow is estimated on the basis of available pump data and the results of the measurements.

Some of the resulting suggestions for improving efficiency might include a speed control upgrade, a motor upgrade, differently dimensioned pipes, the installation of a controller, or perhaps an agreement for routine service.

Complete pump audit

The efficiency analysis offered by Grundfos makes up the first step in our Pump Audit, a diagnostics tool that we use to check whether the pump system is operating at the optimal energy consumption to guarantee that your costs are kept to an absolute minimum – now and in the future. See "Replacement analysis" to find out more about the Grundfos Pump Audit.

Service agreement

A Grundfos service agreement ensures the efficient and uninterrupted operation of your pump system and gives you access to Grundfos service centres and authorised service partners worldwide, 24 hours a day.

Prevention is better, and more cost-effective, than cure

Once you have purchased your pump, you will want it to function efficiently and reliably; a formal service agreement with Grundfos will give you peace of mind. It also makes sound economic sense, giving you a firm costing for your maintenance budget and access to substantial discounts.

You simply combine a range of service programmes to suit your needs – and then let us carry out scheduled maintenance visits to prevent downtime. We offer three types of service agreement, available for all pumps:

  • Basic
  • Extended
  • Total.


Whichever agreement you choose, your equipment will always be serviced by specially trained staff.

The cost-effective choice

Well-maintained pumps can reduce your energy consumption by up to 50 %. Furthermore, it's worth remembering that in a series of pumps working together, one faulty pump can affect all the others. A Grundfos service agreement keeps the total cost of operating a pump to a minimum. Our careful calculation of the life-cycle cost of all our products means that we have an overview of the true costs of owning each of our pumps.

Signing up for a service agreement and letting our highly-skilled service technicians service your pumps is a safeguard against unforeseen expenditure. Regular servicing and maintenance of your pumps will ensure that they operate with optimum efficiency.

Repair and maintenance

Grundfos Service will maintain and repair your pumps. Our service professionals can also advise you on efficiency issues, offering suggestions for saving money in the long term.

Repair and maintenance of your existing pump systems

Naturally, you can always call Grundfos for the repair and maintenance of pumps you have purchased from us. Grundfos can repair your pumps to the same specifications as new. However, it is important to remember that an upgrade or even a replacement pump can be cheaper than repair in the long term. See "Upgrades and Replacement" for how this makes good business sense.

Effective service – wherever you are

Grundfos Service is always close by. Working in collaboration with our local authorised service partners we offer worldwide service. Help from qualified pump professionals is never far away, whether you need immediate assistance or are interested in hearing about opportunities for making savings.

Grundfos Remote Management

Grundfos Remote Management is a cost-effective, secure and reliable way to monitor and manage pump installations from an Internet PC at a very low cost.

Connecting pumps and people

With a secure and reliable remote management system, you can monitor and manage your pump systems from an Internet PC at a very low cost.

Grundfos Remote Management is a cost-effective and straightforward system for monitoring and managing pump installations in commercial buildings and in water supply and wastewater systems. It reduces the need for onsite inspections, and in the event of an alarm or warning, the relevant people are notified directly.

The system offers a wider range of benefits and functions than mobile-phone-based monitoring. For those who do not require remote process automation, Grundfos Remote Management is the ideal solution for monitoring and remote control, rather than traditional SCADA (Supervisory Control and Data Acquisition) systems. Initial investment is minimal, and a fixed low fee covers data traffic, hosting costs and system support, including back-up of all data.

Efficient alarm management

The on-call schedule in this new telemetry system ensures that alarm messages from onsite controllers go directly to the relevant people. The system manager can log on from a PC anywhere and plan who is to receive alarm messages from each installation at any given time of the day. Managers can plan for years ahead, and can easily handle day-to-day exceptions to the schedule.

Optimise service and maintenance

Changes in pump performance can be tracked using trend graphs generated automatically by the system. This tracking can give an indication of any wear or damage in the installation, and service and maintenance can be planned accordingly.

The communication interface (the CIU271 modem) enables data transmission via GPRS/SMS from your Grundfos pumps and controllers. The built-in multi-purpose I/O board allows you to connect sensors and switches.





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Replacement

Replacement

The Grundfos Pump Audit is our replacement analysis. It is a complete diagnostic tool that considers your facility, the energy efficiency of your system, and the total life-cycle costs of your pumping solution. It provides detailed recommendations for replacement, including estimated payback time.
Let our Pump Audit tell you how to save on energy costs

The Grundfos Pump Audit is a comprehensive check-up of your pump system. It measures flow, pressure, power absorbed, and overall efficiency of the pumps you have installed over a given period, and highlights how much energy you could save by switching to more efficient pumps and motors.

The process starts with the Pump Audit team visiting your facility and listening to your description of your requirements, with the aim of ensuring the best possible definition of the task ahead. The next step is a comprehensive on-site visual inspection of your facility. This includes inspection of the operating environment, pumps, valves and line drawings.

CAPS

The purpose of CAPS is to provide a complete tool that contains both an extensive catalogue of Grundfos products and a sizing program to select the most suitable pump for your application.

There is also a comprehensive pump replacement selection function for central heating circulator pumps, hot water pumps and wastewater S pumps, and a function for producing professional quotations that include curves, drawings, quotation texts, wiring diagrams, etc.

Last but not least, the software contains the instruction and operating manuals for nearly all Grundfos pumps in multiple languages. Service drawings, exploded views and parts lists are available for all sewage products as well as several other pump types.

CAPS is available in two versions: WinCAPS, available on CD-ROM, and the online version WebCAPS, available at the Grundfos website. Additional features available in WebCAPS include CAD Drawings and Literature.





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Spare parts

Spare parts

"BE Responsible" is one of our core values at Grundfos. It is essential to us that our pumps are designed for low energy consumption and the highest possible performance throughout their operating lives. One consequence of this is that service offerings, including spare parts and replacement kits, are defined in the development phase.
Customised service offerings, online ordering and rapid response distribution centres ensure that you have the parts when you need them.

Recommended spare parts list

The list specifies the parts you should keep on site to service your pumps. These recommendations can be found at the product site in our WebCAPS tool.

Specially designed service kits

Service kits include everything you need for a specific maintenance or repair task, including instructions for dismantling, replacement and reassembly.

24-hour spare part delivery service

To be extra sure that you do not have to wait, we can set aside a stock of spare parts that are critical for your operation. This will ensure that they are available whenever you need them.

10-year guarantee

We guarantee that spare parts for any Grundfos pump you buy today will remain available for at least the next 10 years.

Service online tool

24-hour access to our online tool WebCAPS is available from any PC. All the technical documentation and information you need to service your pumps is immediately available to you, at any time:

  • Service instructions
  • Step-by-step service videos
  • Interactive exploded views
  • Sectional drawings

 

Service video

A service video is available for this product. The service video is an easy way to see how to disassemble and assemble the pump.

The WebCAPS literature and service sections offer quick and easy access to service videos.
There are two different ways to access the videos from the WebCAPS home page:

  • Via Service
  • Via Literature


The videos are also available on CD-ROM and DVD.





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Contact
Sales office

Contact us

Select country to contact your local sales company


Telephone

01-4089800

Fax

01-4569459

Address

Unit A Merrywell Business Park
Ballymount Road Lower
Dublin 12
D12 PW56

Service center

Contact us

Select country to contact your local sales company


Telephone

01-4089800

Fax

01-4569459

Address

Unit A Merrywell Business Park
Ballymount Road Lower
Dublin 12
D12 PW56